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As the call is initiated from the user's browser, any PubMatic cookie (KADUSERCOOKIE) stored on the user's browser will be used directly by the PubMatic ad server. To perform sync up-pixeling, the publisher should call the following URL in an iframe on every page hit.


New URL  to be used:


Old URL (deprecated):


PubMatic is planning to deprecate uer_sync.html soon, therefore, it is recommended to use the userSync.js instead. For more detailed information on userSync.js, refer to userSync.js for Cookie-Sync GDPR Compliance 

Synchronous Tag Example

Code Block
<script type="text/javascript">
            var script = document.createElement('script');
            script.async = true;
            script.type = 'text/javascript';
            script.src = '';
            script.onload = function(){
                    pubId: 12345,
                    siteId: 23456
            var node = document.getElementsByTagName('script')[0];
            node.parentNode.insertBefore(script, node);